For the last 10 years we’ve been deluged with news stories and investment analyses that extoll the virtues of lithium-ion batteries and speculate on the technology’s potential to change the world’s energy landscape forever. While the occasional curmudgeon like my colleague Jack Lifton questions the availability of enough lithium or flake graphite to satisfy soaring demand from the battery industry, everybody has overlooked or ignored the most critical mineral constraint – Cobalt.